The high overtone QNMs of Schwarzschild-AdS black holes were calculated numerically for scalar, electromagnetic, and gravitational perturbations in four spacetime dimensions by Cardoso, Konoplya, and Lemos in [1]}. Analytic calculations of the infinitely high overtone (asymptotic) QNMs of four dimensional Schwarzschild-AdS black holes were done by Cardoso et al in [2]} using a method based on the monodromy technique developed by Motl and Neitzke [3]}, [4]}. Natario and Schiappa, in [5]}, generalized the analytic results to include Schwarzschild-AdS black holes in dimensions greater than four and Ghosh et al [6]} generalized the analytic results further by studying the infinitely high overtone QNMs of asymptotically non-flat black holes in a generic way.
